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Prime Minister Boris Johnson appealed to lawmakers to back his last-minute Brexit deal in an extraordinary sitting of the British parliament on Saturday after his plans were plunged into chaos by his opponents’ moves to derail the legislation.

More than three years since the United Kingdom voted 52-48% to leave the European project, Johnson sought parliament’s approval for the divorce treaty he struck in Brussels on Thursday.

He said he was confident he had secured the best possible deal and there was little appetite for further delay.

“If there is one feeling that unites the British public with a growing number of officials in the EU it is a burning desire to get Brexit done,” Johnson said. “Further delay is pointless, expensive and deeply corrosive of public trust.”

But Johnson’s opponents have laid a parliamentary booby trap that could frustrate his plans and force him to send members of parliament home without voting on his deal on Saturday, forcing a further delay in achieving Brexit.

Former Conservative lawmaker Oliver Letwin, expelled from the party by Johnson, has proposed that the decision on whether to back a deal be deferred until all the legislation needed to implement it has been passed through parliament.

Even though Johnson believes this can be achieved by Oct. 31, others think it would need a short ‘technical’ delay.

A law passed by Johnson’s opponents obliges him to ask the EU for a Brexit delay until Jan. 31, 2020 unless he has secured approval for his deal by the end of Saturday.

Letwin’s proposal, which has cross-party support, will be put to a vote at the end of Saturday’s debate. If approved by parliament, Johnson’s deal would not then be put to a vote on Saturday.

“My aim is to ensure that Boris’s deal succeeds,” said Letwin, expelled from the Conservative Party for refusing to back Johnson’s plans to leave the EU with or without a deal.

But Letwin wanted “an insurance policy which prevents the UK from crashing out on 31 October by mistake if something goes wrong during the passage of the implementing legislation”.

In a day of Brexit high drama, lawmakers convened for the first Saturday sitting since the 1982 Argentine invasion of the Falklands, while hundreds of thousands of people are due to march to parliament demanding another referendum.

Jeremy Corbyn, leader of the main opposition Labour Party, backed a second referendum.

“Voting for a deal today won’t end Brexit. It won’t deliver certainty and the people should have the final say,” Corbyn told parliament.

Johnson has depicted the vote as the last chance to secure an orderly Brexit. Though he is obliged by law to seek a Brexit delay if his deal falls, Johnson said the United Kingdom would still leave on Oct. 31. He did not explain how.

Brexit “Super Saturday” tops a frenetic week which saw Johnson confound his opponents by clinching a new Brexit deal.

In a divided parliament where he has no majority, Johnson must now win the support of 320 lawmakers to pass his deal.

If he wins the vote, Johnson will go down in history as the leader who delivered a Brexit – for good or bad – that pulls the United Kingdom far out of the EU’s orbit.

Should he fail, Johnson will face the humiliation of Brexit unravelling after repeatedly promising that he would get it done – “do or die” – by Oct. 31.

Johnson won the top job by staking his career on getting Brexit done by the latest deadline of Oct. 31 after his predecessor, Theresa May, was forced to delay the departure date. Parliament rejected her deal three times, by margins of between 58 and 230 votes earlier this year.

He said Saturday was the last chance to get Brexit done with lawmakers facing the option of either approving the deal or propelling the United Kingdom to a disorderly no-deal exit that could divide the West, hurt global growth and bring renewed violence to Northern Ireland.

To win, Johnson must persuade enough Brexit-supporting rebels in both his own Conservative Party and the opposition Labour Party to back his deal. His Northern Irish allies and the three main opposition parties oppose it.

In a boost for Johnson, some influential hardline Brexit supporters such as Mark Francois and Iain Duncan Smith said they would support the deal.

Steve Baker, the head of a hardline Brexit faction in the Conservative Party, has told his European Research Group allies they should vote for Johnson’s deal.